Case Study of Modified H-B Strength Criterion in Discrimination of Surrounding Rock Loose Circle

  • Rui Wang
  • Xianghui DengEmail author
  • Yaoyao Meng
  • Dongyang Yuan
  • Daohong Xia
Tunnel Engineering


Intermediate principal stress is a significant factor when calculate to determine the surrounding rock loose circles. Based on it, this paper is trying to modify the Hoek-Brown strength criterion, and put forwards a theoretical formula of the loose circle radius. The theoretical formula is applied to Shimen Tunnel, and a comparative analysis between theoretical calculations and field test results is conducted. Here are the results as follows: 1) With an increase of intermediate principal stress, the strength of the rock mass increases and the surrounding rock becomes more difficult to break. Consequently, loose circle thickness is gradually reduced and forms a significant negative linear relationship with the Lode parameter. 2) The results indicate that with a decrease of surrounding rock level in a three-lane hard rock tunnel, the radius of the loose circle increases continuously. 3) The results of the field acoustic wave test show that the theoretical calculation values are consistent with the field measurement results. According to above analysis, the deduced formula is feasible.


loose circle H-B strength criterion intermediate principal stress lode parameter acoustic testing method 


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Copyright information

© Korean Society of Civil Engineers and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Rui Wang
    • 1
    • 2
  • Xianghui Deng
    • 2
    Email author
  • Yaoyao Meng
    • 2
  • Dongyang Yuan
    • 2
  • Daohong Xia
    • 2
  1. 1.School of Civil Engineering and ArchitectureXi’an University of TechnologyXi’anChina
  2. 2.School of Civil & Architecture EngineeringXi’an Technological UniversityXi’anChina

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